I'll rate your team after you implement the changes NWO suggested and you considered, makes it easier for me. Also keep in mind what Razza said, only VM people you know rate teams, which is mostly people with this badge () or that have VM me for a rate in their signature.
idk know a lot about BW OU sorry man, but a mixrachi looks cool with iron head fire punch hidden power ice tbolt over your current one, give it a shuca berry or an expert belt. idk a good spread though, shakeitup has a RMT with a good one i think you can look at it. then, give dragonite fire punch or eq over ice beam. not sure if this will work, but you dont lose anything trying it out!